A Disposable Organophosphorus Pesticides Enzyme Biosensor Based on Magnetic Composite Nano-Particles Modified Screen Printed Carbon ElectrodeReport as inadecuate




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1

The State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Material Science and Chemical Engineering of Ningbo University, Ningbo, 315211, China

2

The Technical Center of Ningbo Entry-Exit Inspection and Quarantine Bureau, Ningbo, 315200, China





*

Author to whom correspondence should be addressed.



Abstract A disposable organophosphorus pesticides OPs enzyme biosensor based on magnetic composite nanoparticle-modified screen printed carbon electrodes SPCE has been developed. Firstly, an acetylcholinesterase AChE-coated Fe3O4-Au GMP magnetic nanoparticulate GMP-AChE was synthesized. Then, GMP-AChE was absorbed on the surface of a SPCE modified by carbon nanotubes CNTs-nano-ZrO2-prussian blue PB-Nafion Nf composite membrane by an external magnetic field. Thus, the biosensor SPCE|CNTs-ZrO2-PB-Nf|GMP-AChE for OPs was fabricated. The surface of the biosensor was characterized by scanning electron micrography SEM and X-ray fluorescence spectrometery XRFS and its electrochemical properties were studied by cyclic voltammetry CV and differential pulse voltammetry DPV. The degree of inhibition A% of the AChE by OPs was determined by measuring the reduction current of the PB generated by the AChE-catalyzed hydrolysis of acetylthiocholine ATCh. In pH = 7.5 KNO3 solution, the A was related linearly to the concentration of dimethoate in the range from 1.0 × 10-3–10 ng•mL-1 with a detection limit of 5.6 × 10-4 ng•mL-1. The recovery rates in Chinese cabbage exhibited a range of 88%–105%. The results were consistent with the standard gas chromatography GC method. Compared with other enzyme biosensors the proposed biosensor exhibited high sensitivity, good selectivity with disposable, low consumption of sample. In particular its surface can be easily renewed by removal of the magnet. The convenient, fast and sensitive voltammetric measurement opens new opportunities for OPs analysis. View Full-Text

Keywords: Fe3O4-Au composite nanoparticles; carbon nanotubes; nano-ZrO2; acetyl-cholinesterase; organophosphorus pesticides; prussian blue; screen-printed carbon electrodes; enzyme biosensor Fe3O4-Au composite nanoparticles; carbon nanotubes; nano-ZrO2; acetyl-cholinesterase; organophosphorus pesticides; prussian blue; screen-printed carbon electrodes; enzyme biosensor





Author: Ning Gan 1,* , Xin Yang 1, Donghua Xie 2, Yuanzhao Wu 1 and Weigang Wen 2

Source: http://mdpi.com/



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